Abstract
This project evaluated the change-in-schedule of intra oral orthodontic elastics in a simulated oral environment. The bands of two manufacturers' American orthodontics and Dentarum were examined with three bands in each subgroup of two groups (I and II). The initial force delivered by randomly selected intra oral elastics was recorded for extensions of 225%, 300% and 450%. Then the elastics were engaged on to a special jig having posts at a distance of 14.8mm, 19mm and 28.4mm in order to extend the diameter of elastics by 225%, 300% and 450% respectively and incubated at 37°C in artificial saliva for 24 and 48 hours of time. Force degradation of intra oral elastics was calculated in grams. Data was analyzed using ANOVA. The force degradation was high during first 24 hours and the elastics should be changed on a daily basis.
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